Water-soluble & available
All nutrients are water-soluble. In the fully diluted mixture, they are available for feeding through roots and leaves.
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- For olive trees · Olea europaea
- With chelated trace nutrients
- For root and foliar feeding
- 250 ml, twin pack or 1 litre
Start simply · explore when you want
Feed olives. Understand Mediterranean growth.
Olive (Olea europaea) is evergreen, but its growth changes through the year. Find application guidance and deeper plant knowledge for containers, gardens and winter quarters.
- Declared NPK
- 4.2 + 3.8 + 3.0With declared trace nutrients.
- Dilution
- 5 ml per 1 l of waterEvery 1–2 weeks during the growing season.
- Application
- Roots & foliageDilute with water before use.
- Regular application period
- April–SeptemberFeed only during active growth.
Product information
Application & dosageMix and apply to suit the growth stage.
Application in one place
Measure. Mix. Apply.
Olive fertiliser calculator
Enter your water volume or use the height and crown width of one olive as a rough watering guide. Choose the concentration by development stage, not tree size alone.
Your water amountRough watering-volume guide
1 l
Matching concentrate amount
5 ml
1 capful = 5 ml. Use a suitable measuring aid for smaller partial amounts.
Enter a water amount from 0.1 to 1,000 litres.
A rough guide for watering the roots of one olive only, not for foliar spraying. Measure height from soil level and crown width. Pot volume, root-ball moisture, rooting, weather and position all matter. Use only when watering is needed; do not force the full guide volume or allow waterlogging.
How the guide is calculated
General GREEN24 guide: height (m) × width (m) × 3–4 litres. Centimetres are converted to metres. Concentrate volume follows this fertiliser’s dilution and the chosen stage. The guide does not measure an individual plant’s water needs.
Prepare a clean container
Use a clean watering can or sprayer; preferably low-lime water or rainwater at 15–25 °C.
Calculate the amount
Enter your water volume. Select established plant, young plant or seedling according to development; the size guide does not determine this choice.
Add some water first
Start by filling the container with part of the chosen water volume.
Shake & measure
Shake the bottle. 1 capful = 5 ml; use a measuring aid for smaller partial amounts.
Add the concentrate
Add the calculated amount of concentrate to the water.
Top up & mix well
Top up to the chosen water volume and mix well. Watering or spraying: see below.
When to feed? Every 1–2 weeks during active growth, regularly from April to September. Water as needed between feeds. Allow for nutrients in the compost and previous applications; pause during dormancy. A warm room alone does not justify an extra winter feeding programme.
Watering · through the roots
Moisten the root zone first, then distribute the mixture evenly. Excess water must drain freely from containers; ensure drainage in garden soil too. Do not feed dry or waterlogged root balls.
Spraying · onto the leaves
Lightly wet the leaves in the morning, evening or overcast conditions, avoiding open flowers. Root and foliar feeding count towards the same feeding schedule, not two parallel programmes.
Olive fertiliser characteristicsThe concentrate and its pack sizes at a glance.
Liquid NPK concentrate for olive trees (Olea europaea), with declared trace nutrients. Dilute with water for root or foliar feeding. Nutrient supply is matched to the active growing period.
NPK 4.2 + 3.8 + 3.0 with trace nutrients. Dilute the concentrate with water before use.
- The same dilution applies to all three pack sizes.
| Pack size | Price | Net mass | Yield at label dilution |
|---|---|---|---|
| 250 ml | €9,95 EUR | 279 g | 50.0 l |
| 500 ml – twin pack (2 × 250 ml) | €18,95 EUR | 558 gcalculated: 2 × 279 g | 100.0 l |
| 1 litre | €29,95 EUR | 1117 g | 200.0 l |
Calculated yield at standard dilution: 250 ml makes 50 litres, 2 × 250 ml makes 100 litres, and 1 litre makes 200 litres of nutrient solution.
Net mass excludes the packaging. The twin-pack total is calculated from two individual bottles.
Fits your care routine
For Olea europaea
For olive trees (Olea europaea) in containers or suitable garden locations. This concentrate is distinct from the ready-to-use AF-OLIVE product.
During active growth
For active growth, regularly April–September. The plant is growing, the root ball is moist and water can drain.
Allow for fresh compost
Allow for existing feed after repotting. Investigate root damage, heavy leaf drop or an unclear condition before adding more fertiliser.
Beyond NPK · understand the formulation
Well mixed – available to leaves and roots
Water-soluble nutrients and coordinated formulation properties make feeding your olive straightforward. Explore what the prepared mixture offers for leaves and roots.
Protected trace nutrients
Copper, iron, manganese and zinc are declared as EDTA chelates. This binding helps keep these trace nutrients available in solution.
pH buffering for the mixture
The buffer system helps regulate the pH of the finished watering or spraying solution. The source water also influences the resulting value.
Even coverage on the leaf
Good wetting and adherence help distribute the spray solution across the leaves. Dissolved nutrients are then available at the leaf surface for uptake.
Reduce hard-water effects
The formulation helps reduce adverse hard-water effects and deposits on the leaves. Low-lime water or rainwater provides a good starting point.
Feed with plant tolerance in mind
High plant tolerance when correctly applied supports developing leaves and shoots. Balanced nutrition supports your olive’s natural foliage appearance.
Understand foliage quality and seasonal growth
Suitable nutrition supports leaf development and green foliage. Leaf finish means an even, well-kept appearance, not a sprayed-on shine. Light, water and root space also shape the tree; cultivar, pollination and weather influence flowers and fruit.
Chelation binds metal ions and can reduce adverse effects of hardness; it does not remove calcium and magnesium from the water. The product pH of 5.9 describes the concentrate. The final mixture’s pH also depends on the source water; no fixed target is promised.
Use clean, suitable watering or spraying equipment. Measure the water and calculated concentrate quantity carefully.
Products
Pre-fertilised soil and fertiliser already in the root ball contribute to the nutrient supply. The products listed under “Mixable with this fertiliser” can each be mixed with this fertiliser. When applying them together, follow both products’ specific instructions; conflicting or stricter directions take precedence. Do not mix undiluted concentrates.
Our Olive Tree Fertiliser can be mixed with Schädlings-Frei Organic, Trauermückenfrei Organic, KIRON Milben-Ex or Rosen Pilz-Frei BOCCACIO, one product at a time. The confirmation applies to fertiliser plus one named partner. Follow the specific directions and stricter conditions of both products.
Nutrient composition · NPKDeclared nutrients and their forms.
The following nutrient contents are declared on the 250 ml and 1 litre bottles. The twin pack consists of two 250 ml bottles.
Declared pH: 5.9. Copper, iron, manganese and zinc are chelated with EDTA.
- Total nitrogen (N): 4.2%.
- Nitrogen forms: 1.0% nitrate nitrogen, 1.7% ammoniacal nitrogen and 1.5% urea nitrogen.
- Water-soluble phosphate (P₂O₅): 3.8%.
- Water-soluble potassium oxide (K₂O): 3.0%.
- Boron (B): 0.0050%.
- Copper (Cu): 0.0020%.
- Iron (Fe): 0.0100%.
- Manganese (Mn): 0.0060%.
- Molybdenum (Mo): 0.0005%.
- Zinc (Zn): 0.0020%.
GREEN24 · Olive knowledge
The olive tree: from silvery leaves to fruit
Nutrients, light, water, root space and temperature work together. Match feeding to your olive tree’s growth and growing conditions.
Evergreen leaves, active roots
Leaves use light, while roots take up water and mineral nutrients. A sunny position, enough root space and free drainage provide the foundation for nutrient supply.
Small flowers through the seasons
Small creamy-white flowers appear among the narrow leaves. Their development also depends on cultivar, temperature and weather. Appropriate nutrition supports growth; it does not trigger flowering on demand.
From blossom to olive
Olives may develop after successful pollination. Water, nutrient supply and suitable conditions support fruit development. Whether fruit sets and ripens depends on factors including cultivar and weather.
Matching products
-
Olive Tree Compost
€7,95 View productFor repotting olives. Pre-fertilised: the compost label specifies additional feeding after 4–6 weeks.
-
Olive Repotting Set
€15,95 View product10 l compost and 250 ml olive fertiliser together. This set already includes this fertiliser.
-
Sneeboer Planting Trowel with Cherry Wood Handle
€54,95 View productFor adding compost and planting work around containers.
-
Garden & planting bag Pro, 140 L
€10,90 View productFor collecting clippings and tidying up after plant care.
Growth & nutrient uptake
Leaves use light; roots take up water and mineral nutrients. The diagrams show how plant organs work together and how nutrients are absorbed.
How an olive grows and takes up nutrients
Roots · absorb & anchorAnchor the tree and explore the moist root zone.
Fine roots need moisture and oxygen. In containers, drainage and available root space are especially important. Drought tolerance in an established olive does not remove the need to check a confined root ball.
Leaves · capture energyNarrow evergreen foliage uses light to make sugars.
Leathery leaves have dark upper surfaces and pale silvery undersides. They persist for several years and are gradually replaced. If leaf drop is heavy, check light, moisture and roots first; evergreen foliage does not mean year-round feeding is needed.
Shoots · support & connectThe trunk and branches support the crown and connect the organs.
Vascular tissue transports water, mineral nutrients and sugars made in the leaves. Prune for your goal: clipping a round crown removes flowering wood. If fruit is the aim, thin selectively rather than cutting back the entire crown hard.
Nutrients · working togetherNitrogen, phosphorus and potassium for mineral nutrition.
Nitrogen supports chlorophyll and protein formation. Phosphorus contributes to energy transfer, while potassium supports water regulation and transport. The formulation supplements these minerals and declared micronutrients; it cannot replace suitable light and root conditions.
How nutrients enter the olive
Select a point in the picture or choose a stage.
Stage 01 / 04
Nutrient solution reaches the olive roots
The mixture reaches the soil around fine roots. Dissolved nutrients are available at the interface between roots and soil.
Good to knowAlways dilute the concentrate and keep to the stated dosage.
A closer look
Watering carries dissolved nutrients into the growing medium around the roots. Contact with the absorbing root surfaces is the first step.
Stage 02 / 04
Uptake at the root surface
Fine root hairs increase contact with the growing medium. Tiny transport proteins in the membranes surrounding root cells help dissolved nutrients enter the cells.
Good to knowRoots take up nutrients; they do not simply absorb all the fertiliser along with the water.
A closer look
Root hairs increase the contact area. Transport proteins in cell membranes enable mineral ions to enter; water movement and nutrient uptake are distinct processes.
Stage 03 / 04
Root cells regulate uptake
In your olive's roots, cell membranes and their transport proteins regulate the uptake of dissolved nutrients. Substances do not simply flow unfiltered into the plant with the irrigation water.
Good to knowMore fertiliser does not automatically mean better nutrition.
A closer look
Between contact with the root surface and onward transport, controlled processes take place within the root tissues. Transport across cell membranes helps the olive take up nutrients; water movement and nutrient uptake are distinct processes.
Stage 04 / 04
Onward to shoots and olive leaves
Inside the root are fine transport channels called xylem. Water and absorbed nutrients can travel through them towards shoots and leaves.
Good to knowHealthy roots and suitable growing conditions are important for nutrient supply.
A closer look
After entering the vascular tissue, nutrients can travel with the water stream in the xylem towards the shoot. Uptake and nutrient supply also depend on root health and growing conditions.
Stage 01 / 04
Diluted solution wets the olive leaf
The fully diluted mixture wets the leaf surface. Avoid open flowers and spray only under suitable application conditions.
Good to knowOlive Tree Fertiliser is also suitable for foliar application. Use only the fully diluted mixture and count the application towards the feeding plan.
A closer look
Foliar feeding places diluted nutrient solution on the leaf surface. Wetting depends on factors including the leaf surface and the solution.
Stage 02 / 04
Uptake across the olive leaf surface
The leaf surface protects the plant. Dissolved nutrients can pass through this layer; tiny openings in the leaf may also play a part. Uptake varies with the type of leaf and the conditions.
Good to knowDifferent leaves do not absorb a nutrient solution equally well.
A closer look
Dissolved nutrients can pass through the protective cuticle; pathways involving stomata may also contribute. Their relative importance varies with plant species and conditions.
Stage 03 / 04
Olive leaf cells take up nutrients
Behind the surface lies living leaf tissue. Its cells can take up nutrients that have crossed the surface and use them for their activities.
Good to knowA droplet on a leaf does not yet mean its nutrients have been absorbed.
A closer look
After crossing the surface, nutrients can be taken up by living leaf cells. The amount depends on factors including the nutrient, formulation and environmental conditions.
Stage 04 / 04
Use within the leaf and possible redistribution
The plant can use absorbed nutrients within the leaf. Some can also reach other plant parts. This depends on the nutrient and the plant's condition.
Good to knowFoliar feeding does not mean every nutrient immediately reaches the whole plant.
A closer look
Absorbed nutrients can be used within the leaf. Whether and how far they move to other plant parts depends on the nutrient and the plant's condition.
Development influences requirements
Distinguish new growth, fruit development and rest
Establishment & young olives
After planting or repotting, ensure suitable moisture and drainage and count any feed already in the compost. A small established olive is not automatically a young plant. Half strength is for young and sensitive plants; one fifth is the separate cautious starting rate for seedlings.
New shoots, flowers & possible fruit
Feed at the stated interval during active growth. Flowering and fruit set also depend on cultivar, pollination and weather. Do not automatically increase concentration after pruning or to obtain more fruit; not every watering needs fertiliser.
Winter quarters & dormancy
Do not feed during dormancy. Overwinter container olives in bright, cool, preferably frost-free conditions; continue checking light, root-ball moisture and pests. Protection outdoors depends on the site, soil and frost conditions.
Consider development, growing conditions and existing nutrients together. An olive’s height determines neither its concentration stage nor its individual water needs.
Application & calculator →Growing conditions & care problems
Adapt care to the growing conditions and stage of growth. If you notice changes, check light, water and roots first — then take targeted action.
Where does your olive grow?
Container · root space and drainage
Choose a sunny, warm, sheltered position. Check surface compost and the root ball before watering, and let excess water drain. A movable container makes transfer to winter quarters easier.
Garden · plan for the site and winter
Planting outdoors requires a suitable sheltered site and free-draining soil. Assess local frost, winter wetness and cultivar together; a universal temperature limit cannot replace this assessment.
Winter quarters · bright and cool
Prepare bright, cool, preferably frost-free quarters before severe frost. Less water may be needed than in summer, but do not let the root ball dry out completely. Investigate leaf loss through light, moisture and roots; do not feed during dormancy.
Repotting · count existing nutrients
In spring, check whether roots fill the container or the compost has lost its structure. Repot when needed into a suitable pot with drainage. Fresh pre-fertilised compost already supplies nutrients; do not feed by the calendar after root damage.
What is changing on your olive tree?
Scale and honeydew
Check leaves, twigs and winter quarters for attached scales and sticky deposits.
Spotted leaves
Dark circular marks with pale halos can suggest a leaf-spot disease. Confirm the cause, collect fallen leaves and avoid prolonged leaf wetness.
Winter leaf loss
Check rootball moisture and light first: both drought and persistently wet roots can cause leaf loss.
Advice for your olive tree
These details help assess growing conditions, root problems or a possible infestation:
- Photos of the whole tree, both sides of affected leaves and unusual twigs; include flowers and fruit when asking about cropping.
- Cultivar, age and planting date, container or open ground, growing medium, summer position and winter quarters.
- When changes began and how they progressed, root-ball moisture, moves, frost exposure and previous feeding and care.
Leaf colour alone identifies neither a nutrient deficiency nor the amount of feed needed. Targeted soil or leaf analysis may help with unclear damage. Identify the cause before choosing a plant-protection treatment.
Mixable with this fertiliser
These 4 products can each be mixed with this fertiliser.
-
Dr. Stähler
Schädlings-Frei-Organic – 100 ml
€16,95
Insect control: check the pest, plant species and authorised application site.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
Trauermückenfrei Organic – 30 ml, neem concentrate against fungus gnat larvae
€9,99
For fungus gnat larvae: follow the authorised crop and watering application.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
KIRON Milben-Ex – 30 ml
€12,95
Mite control: identify the infestation and follow the authorised application.
Mixable with GREEN24 liquid fertilisersView product & application -
Dr. Stähler
BOCCACIO Rosen Pilz-Frei – 24 ml
€13,95
Fungal control: check the disease, plant species and authorised growing situation.
Mixable with GREEN24 liquid fertilisersView product & application
Mixability applies to fertiliser plus one product at a time, not to all products mixed together. Follow crop, pest, application site, dose, waiting periods and the stricter requirements of both sets of instructions. Do not mix undiluted concentrates.
Use plant protection products safely. Always read the label and product information before use.
PLANTS A–Z
Your olive through the year
Position, pruning, repotting and winter care: the plant profile guides you through caring for Olea europaea.
View the olive plant profile
PRACTICAL ADVICE
Why more fertiliser cannot solve everything
The law of the minimum explains how a factor in short supply can limit growth. More fertiliser cannot replace missing light, water or healthy roots.
Understand the law of the minimum
Quality products
Horticultural expertise
Our own production
Made in GermanyGREEN24's own products
Quick answers before you buy (FAQ)
Is this fertiliser suitable for my plant?
For olive trees (Olea europaea) in containers or suitable garden locations. This concentrate is distinct from the ready-to-use AF-OLIVE product.
How do I dilute the concentrate?
Dilution: 5 ml concentrate per 1 litre of water. Applies to 250 ml, twin pack and 1 litre.
Measure out the concentrate and mix it with the stated amount of water. Never apply undiluted.
How much solution does one pack make?
- 500 ml – twin pack (2 × 250 ml): 100 litres of diluted solution
- 250 ml: 50 litres of diluted solution
- 1 litre: 200 litres of diluted solution
Calculated at the stated standard dilution; the amount needed per application depends on the plant and growing conditions.
What should I check before use?
Do not apply in sunlight, below 5 °C or above 30 °C. Never apply the concentrate undiluted.
Safety and storage
Safety instructions
SDS – Safety data sheet available on request.
- Avoid contact with eyes, skin and clothing. Do not inhale spray mist.
- Wear protective clothing, rubber gloves and safety glasses when handling the product.
- Keep away from food and beverages. Wash your face and hands thoroughly after use.
- Official advisory recommendations take precedence. Fertilisers may leave permanent stains on surfaces.
- Do not allow fertiliser to enter bodies of water or wastewater.
The product label takes precedence. Also consult the application leaflet.
Wash your face and hands thoroughly. Use diluted fertiliser promptly and keep it out of water bodies and wastewater.
Product GPSR safety information
The original leaflet explains safe mixing and use. Follow this olive fertiliser’s own dilution in the calculator. Half strength for young and sensitive plants comes from leaflet 130405; one fifth for seedlings is a separate cautious starting rate, not a label stage. Try it on a test plant first and increase towards the standard rate if needed.
Storage
Storage & product quality
Store in a dry, dark place above +8 °C and no higher than +38 °C. Keep out of reach of children and animals.
Keep tightly closed in the original container, separate from food and animal feed.
Avoid large temperature fluctuations. Temperature-related discolouration or crystals may occur; the crystals dissolve by the dilution stage at the latest and do not impair product quality. For this fertiliser, store dry and dark above 8 °C and at no more than 38 °C. Use diluted fertiliser promptly.
Do not allow fertiliser residues or rinsing water to enter waterways or wastewater. Follow the disposal instructions on the packaging.
Measure concentrate accurately and apply only after dilution. More fertiliser does not compensate for insufficient light, drought or damaged roots.
Manufacturer / company placing the product on the market
Guides for this product
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